Bootstrap: Switch to Sass variant

- Use the bootstrap-sass-official till the Bower package can be renamed
- Monkey patch the LESS "fadein" function till the next release where it
is fixed
- Mute CSSLint warnings that are introduced by the Bootstrap mixins
change to left menu to make it more contextual
Eliminated duplicate column count CSS and split media-query specific CSS into separate files
Forms: Switched to Boostrap markup including Bootstrap alerts and labels for errors (partially fixes #4812)
Merge pull request #4845 from shawnthompson/left-nav

change to left menu to make it more contextual
Merge pull request #4846 from pjackson28/removeduplicatecolumncount

Eliminated duplicate column count CSS and split media-query specific CSS into separate files
Merge pull request #4844 from pjackson28/fixformvaliddesign

Forms: Switched to Boostrap markup including Bootstrap alerts and labels for errors (partially fixes #4812)
Merge pull request #4827 from nschonni/v4-bootstrap-sass

Bootstrap: Switch to Sass variant
Moved all SCSS placeholders to the root of each file since ignored otherwise
Merge pull request #4848 from pjackson28/fixtabscarousel

Moved all SCSS placeholders to the root of each file since ignored otherwise
Fixed 404 error with Form validation CSS and corrected typo in zebra striping
Merge pull request #4849 from pjackson28/fixformvalid404

Fixed 404 error with Form validation CSS and corrected typo in zebra striping
Forms: Added red asterisk to mandatory fields and red colour to required text (partially fixes #4812)
Merge pull request #4850 from pjackson28/addasterisksforms

Forms: Added red asterisk to mandatory fields and red colour to required text (partially fixes #4812)
Forms: Added rtl support for required field asterisks
Merge pull request #4851 from pjackson28/addformasteriskrtl

Forms: Added rtl support for required field asterisks
Changed gray colour variable names to avoid conflicts with Bootstrap variables
Forms validation: Enabled turning on and off red colour for fields in error (partially fixes #4812)
Merge pull request #4852 from pjackson28/changeinputfieldcolouronerror

 Forms validation: Enabled turning on and off red colour for fields in error (partially fixes #4812)
Form validation: Italicized the required label (partially fixes #4812)